patch 8.2.2897: Vim9: can use reserved words at the script level

Problem:    Vim9: can use reserved words at the script level.
Solution:   Check variable names for reserved words. (closes #8253)
diff --git a/src/version.c b/src/version.c
index b20a149..da315bf 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2897,
+/**/
     2896,
 /**/
     2895,